/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifndef PseudoStyleRequest_h
#define PseudoStyleRequest_h

#include "core/layout/LayoutScrollbar.h"
#include "core/style/ComputedStyleConstants.h"
#include "platform/scroll/ScrollTypes.h"

namespace blink {

class ComputedStyle;

class PseudoStyleRequest {
    DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
public:

    enum RequestType { ForRenderer, ForComputedStyle };

    PseudoStyleRequest(PseudoId pseudoId, LayoutScrollbar* scrollbar = 0, ScrollbarPart scrollbarPart = NoPart)
        : pseudoId(pseudoId)
        , type(ForRenderer)
        , scrollbarPart(scrollbarPart)
        , scrollbar(scrollbar)
    {
    }

    PseudoStyleRequest(PseudoId pseudoId, RequestType requestType)
        : pseudoId(pseudoId)
        , type(requestType)
        , scrollbarPart(NoPart)
        , scrollbar(nullptr)
    {
    }

    DEFINE_INLINE_TRACE()
    {
        visitor->trace(scrollbar);
    }

    // The spec disallows inheritance for ::backdrop.
    bool allowsInheritance(const ComputedStyle* parentStyle) const
    {
        return parentStyle && pseudoId != BACKDROP;
    }

    PseudoId pseudoId;
    RequestType type;
    ScrollbarPart scrollbarPart;
    RawPtrWillBeMember<LayoutScrollbar> scrollbar;
};

} // namespace blink

#endif // PseudoStyleRequest_h
